Worms eat kitchen scraps and create worm castings, which are a valuable soil amendment and plant tonic. Though castings are often called fertilizer, they’re actually not very high in nitrogen, but they are full of plant-supporting nutrients.
Sprinkle castings on potted plants and over garden beds. A little goes a long way. A handful can go into the bottom of a planting hole to get a plant off to a good start. Unlike nitrogen-rich fertilizers, worm castings won’t burn the plant’s roots. They can also be mixed with potting soil, in concentrations of up to 20 percent castings, to make an extra-rich growing medium.